Occupancy and habitat associations of four species of sciurids in ponderosa pine-gambel oak (pinus ponderosa-quercus Gambelit) forests in northern Arizona

Citation metadata

Date: June 2011
From: Southwestern Naturalist(Vol. 56, Issue 2)
Publisher: Southwestern Association of Naturalists
Document Type: Report
Length: 5,455 words
Lexile Measure: 1320L

Document controls

Main content

Abstract :

In ponderosa pine-Gambel oak (Pinus ponderosa-Quercus gambelii) forests of north-central Arizona, we examined occupancy and habitats of four species of sciurids (rock squirrel Spermophilus variegatus, golden-mantled ground squirrel S. lateralis, gray-collared chipmunk Tamias cinereicollis, cliff chipmunk T. dorsalis). Numbers of captures were highly variable, suggesting a patchy distribution of species. All four species co-occurred on only one of the study sites. Gray-collared chipmunks and golden-mantled ground squirrels were relatively common on one site only. Golden-mantled ground squirrels were associated with mature forests with high canopy cover and low basal area, whereas gray-collared chipmunks were in locations with large numbers of logs and shallow litter. The two species of chipmunks appeared to be separated in space; gray-collared chipmunks were more common where cliff chipmunks were least common. Rock squirrels were relatively ubiquitous. There was evidence for an association of rock squirrels with increasing rocky cover and decreasing canopy cover, whereas cliff chipmunks occupied rocky areas with high canopy cover and numerous shrubs. En bosques de pino ponderosa-encino Gambel (Pinus ponderosa-Quercus gambelii)en la parte centro-norte de Arizona, examinamos ocupacion y habitat de cuatro especies de sciuridos-ardilla de roca (Spermophilus variegatus), ardilla de manto dorado (S. lateralis), ardilla de pata anillada (Tamias cinereicollis) y ardilla rayada de barranca (T. dorsalis). Las tasas de captura fueron altamente variables, lo que sugiere que estas especies se distribuyen en parches. Las cuatro especies cohabitaron en solo uno de los sitios de estudio. Las ardillas de pata anillada y las ardillas de manto dorado fueron relativamente comunes en solo uno de los sitios. Las ardillas de manto dorado se encontraron asociadas con bosques maduros con alta cobertura de dosel y areas basales bajas, mientras que las ardillas de pata anillada estuvieron en sitios con abundancia de troncos caidos y poca hojarasca. Las dos especies de ardillas del genero Tamias presentaron separacion espacial; la ardilla de pata anillada fue mas comun en los sitios en los que la ardilla rayada de barranca fue menos comun. Las ardillas rayadas de barranca se encontraron ubicuamente. Hubo evidencia que sugiere una asociacioin entre las ardillas de roca en sitios con mayor cobertura de rocas y menor cobertura de dosel, mientras que las ardillas rayadas de barranco ocuparon sitios rocosos con un alto porcentaje de cobertura de dosel y abundancia de arbustos.

Source Citation

Source Citation   

Gale Document Number: GALE|A262145145